Index: branches/5.1.x/core/units/categories/categories_event_handler.php
===================================================================
diff -u -N -r14369 -r14371
--- branches/5.1.x/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 14369)
+++ branches/5.1.x/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 14371)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: categories_event_handler.php 14369 2011-06-20 13:26:55Z alex $
+* @version	$Id: categories_event_handler.php 14371 2011-06-20 13:29:13Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -1600,7 +1600,8 @@
 
 			$root_category = $this->Application->getBaseCategory();
 
-			if (($object->GetDBField('ParentId') == $root_category) && ($object->GetDBField('Template') == CATEGORY_TEMPLATE_INHERIT)) {
+			if ( file_exists(FULL_PATH . '/themes') && ($object->GetDBField('ParentId') == $root_category) && ($object->GetDBField('Template') == CATEGORY_TEMPLATE_INHERIT) ) {
+				// there are themes + creating top level category
 				$object->SetError('Template', 'no_inherit');
 			}